Delayed cut-off for incandescent gas-lamps



v R. B. SMITH. DELAYED CUT-OFF FOR INCANDESCENT GAS LAMPS. APPLICATION FILED AUG-2| 1916. RENEWED OCT- 4,1920.

UNITED STATES PATENT OFFICE.

RAYMOND 1). SMITH, OF ILTON, MAs'sAoIIUsETTs sSIGNoR To SHAwMuT MACHINE WORKS, INC., on BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

DELAYED CUT OFF FOR INCANDESGENT GAS-LAMPS.

Specification of Letterslatent.

Patented July 5, 1921 Application filed-August 2, 1916, Serial NO. 112,828. Renewed October 4, 1920. Serial No. 414,649.

1 '0 all whom it may concern 7 Be it known that I, RAYMOND D. SMITH, a citizen of the United States, residing at Milton, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Delayed Cut- Oifs for Incandescent Gas-Lamps, of which the following is a specification.

My present invention relates to delayed cut-olfs for illuminating gas burners of the Bunsen type wherein the light is produced by the incandescence of a mantle, or noncombustible fabricstructure, suspended from above, and directly over, the upper, open end of a vertical mixing chamber for the gas and air of the Bunsen burner; the lower portion of said mantle overhanging and surrounding the upper portion of said mixing chamber; and the entire mantle structure being contained within a chimney chamber, substantially closed at the bottom and Open at the top, with the usual air vents inthe wall of the chimney.

The principal object of the invention is to provide in self-contained combination with an illuminating gas burner of the type above described, a valve for controlling the supply of gas to such burner, and manually operable automatic instrumentalities for said valve, whereby one manual actuation of said instrumentalities will open the valve to deliver gas continuously to the incandescent mantle burner (which may then be lighted as usual and remain in operation for an indefinite periodof time) and whereby a subsequent manual actuation of said instrumen'talities will render same operative toeffect delayed, lamp-extinguishing closure of the valve; The time interval before such closure is then controlled by thermostatic means subject to the heat of a normally inactive, auxiliary burner to which gas is supplied by the above mentioned subsequent actuation, which auxiliary burner is there.-

upon ignited by the heat from the main burner and thermally energizes the thermostat, thus releasing tensioned actuating means and causing thereby a quick and positive closure of thevalve and complete extinguishment of boththe main and auxiliary burners. V

A further object of my invention is to provide, in such, an illuminating burner, simple and efiicientmeans for causing reliable automatic ignition of the auxiliary burner from the heat of the main mantle burner, wlthout lmpairment of the mantle (which latter is very frail and brittle) and iliary burner parts, the upper mantle structure being Omitted and certain parts broken away to more, clearlyshow the valve mechamsm; Fig. 3 1s a front elevation of the of the valve mechanism and of certain aux- I valve controlling mechanism, showing the I 1 position of parts after automatic closure of the valve; Fig. 4 is an enlarged partial section taken on the 'plane4l l' in Fig. 2 showing the arrangement of valve ports and their relative positions during normal Operation.

of the main illuminating'burner; Fig. 5 is a section similar to Fig. 4, but'showing a different relation of ports; Fig. 6. shows the relation of valve ports when the, light, has

been extinguished; Fig. 7 is a partial elevation looking at the right of Fig. 1; Fig.8 is a view Similar to Fig. 3 showing the position of the valve controlling mechanism after manual actuation of extinguishing means and before automatic closure of the valve or while the thermostat is heating. slmilar and corresponding parts are indicated throughout the drawings and designated in the following'description by the same numerals.

Referring to Fig. 1, particularly, the illu I minating'mant'le appears at 1, and is of the conventional type suspended by its top betweenthe legs of a staple-shaped, single wire Support 2' which legs at their bottom are fixed to a cylindrical metal shell base 3 extending into the open bottomof the mantle Sufiiciently to steady the latter and externally mounted on the open and en'- larged upper portion 4 of the upright, com- I bined supporting stem and mixing chamber 5 for the gas and air'of the main Bunsen burner. At the bottom of the mixing chamher 5, is shownthe usual gas injector and air intake construction whereinadjustment Bunsen gas burner construction being the gas supply may be had by turning' the hood 9. The hood 9 has in its bottom surface numer ous perforations 10, for the entrance of air to the mixing chamber 5, such well known in the art.

The combined supporting stem and mix- 'ing chamber 5' terminates'fbelow the Bunsen gas injector constructionrin an internally threaded portion 11 and'is mounted at this portion upon a valve block 12 which latter, at its bottom, has an internally threaded portion 14,"by means of which the entire structure may be mounted upon the usual gas bracket or chandelier.

The enlarged upper portion 4:- of the mixing chamber 5 is removable from the latter and is structurally integral with a punched 'metal, circular bracket 13 having a floor portion which may be formed by a separate I "annularly shaped disk such as 13 spun into 22,--of the valve block.

fully'note'd that the upper orifice of the auxthe bracket 13 and servingthereby to reinforce the same, to check excessive upward air draft past the mantle and to prevent broken particles of the mantle, -etc., from falling out of the combustion chamber. The bracket 13 is arranged to receive and hold a cylindrical glass chimney 16 having openings 17 in its wall.

The valve block contains the usual rotary tapered valve plug 15 whose axis lies transverse of the vertical main gas passage 18, through said block, and which, when rotativ'ely actuated by mechanism to be described hereinafter, controls the supply of gasto boththe main burner stem 5 and to a' small auxiliary heating burner 21 that extends upwardly from a bracket extension It should be careiliary heater burner 21 is at a-substantially higher level than the perforated bottom portion of the air intake-opening hood 9 of the main Bunsen burner and that said hood eflectivel-y separates the. said air openings from the burner 21. -Were the air intakeopening not shielded from the flame ofthe auxiliary burner, the latter would ignite the gas at its point of injection into the main .Bunsen burner mixing chamber, and thereby impair the operation of the main illuminating burner. Adjustment of the supply of gas'to the burner 21 may be had by the screw '23. v

' Inthe other bracket extension 24 of the valve block 12, an upwardly slanting gas port 27 is shown leading from the main gas passage, below the valve plug 15, to the-base is controlled.

of an upright tube 25 which tube its top is inclosedby a larger clay tube 28, the upper end of the latter being adjacent to the mantle. Gas supply to this tube may be controlled by the adjusting screw 26. It will be evident thatwhen ignited, the small flame 29 at the top of the tube (commonly called a pilot light) will remain constantly burning independent of the van e15 and that this flame is so. situated as to ignite the main mantle burner whenever gas is supplied to the latter.

Referring particularly to Figs. 2," 3 and 8, I shall now describe the mechanism by which the movement of the valve plug 15 to the broken line position, thus'disengaging Manual control of this mechanism is afforded by the chains 65 and- 68. A downward pull on chain 68in Fig.3 first swings the spring actuated latch lever .66

it from the locking projection 7 8 of the vertrol lever.35 which carries the chain 65at tical,-circular supporting plate 31which is "fixed to the valve block. The latch lever'66 its other end and which is loosely -mounted on a stem extension 30ofthe valve plug. 15. Further pull on the chain'68will therefore swing the control lever 35 to its position indicated by broken lines :in Fig. 3, where it will be stopped by engagement with an other projection 54. of the supporting: plate 31. During this movement, the valve plug has been positively rotated a. corresponding amount by engagement of the control lever 35 with a rearwardly bent extension;37;o,f

the dog member 36, the latter being fast'to the end of the valve stem 30 and normally held in such engagement with the control lever 35'by a spring 38, one end of-which is hooked under the edge'of control lever 35 1 and the other end of which is hooke'dover the extension 37. Controlfchain 65 maynow be pulled downwardly which will swing the control lever 35; in the, reverse direction locks'said control lever in thepositionshown in Figs. 3 and 8. -But from Fig.8 it will be seenthatduring thelatter movement,the dog member 36 has been intercepted in an until the spring 'latchlever 66 automatically intermediate positionand that-it is held in this positlon aga nst the tension of spring 38 by a spur shaped projection 52' carried the, curved bi fast .tothe inner surface of metallic thermostat 53,-- r

The-thermostat53 is mounted at oneend to'the'projection- 5/1 of the supporting. plate and is clamped thereto in surface contact with the base of an upwardly extending heater member 56 by screws 55, The

heater member 56 terminates in a hooded. portion 57 that is perforated at its top ande is positioned directly overf the jauxiliary burner 21. Directlyabove thishoode'd termini 5151;?

heater memberis an open ignition tube 32 supported by and preferably flush at its top with the 'hereinbefore mentioned annular floor porti0n 13 of the chimney-holder 13 and opening therethrough into the bottom of the main mantle chimney chamber. The lower end of this ignition tube encompasses the perforated top of the heater hood but leaves a free passage for air into said tube around the exterior of the hood. In the construction illustrated two means are provided for maintaining the necessary vertical alinement of the'ignition tube 32 above the flame orifice of heater burner 21. One of these is the vertical overlapping at the bottom of said tube and the top of heater hood 57. Or in case these two parts should not so overlap the protrusion of pilot tube 25 through the chimney holder 13 and its annular floor portion 13, will maintain the designed rotative position of the removable holder 13 on the Bunsen stem 5. Such use for the pilot tube 25 constitutes a new and useful function thereof in the arrangement herein disclosed. Gas rising from the auxiliary burner 21 and through the opening at the top of the heater hood is guided upwardly through the chimney tube 32 into the chimney inclosed space surrounding the mantle, and upon igniting from the heat of the latter, flares back through said tube and subsequently burns with a blue flame at the top of the burner 21 only, and under the hood 57 as shown in Fig. '8. A loose stationary roller 61 is mounted on a stud projecting from the support plate 31 and engages the inner surface of the thermostat to help the thermostat bearthe load of the tensioned dog member 36. This dog member engages the thermostat spur 52 by means of a spring actuated latch 46, pivoted to the dog member at 47, and capable of yielding in one direction only, namely counter clockwise in Fig. 8, or when passing the spur 52 by clock-wise rotation of the dog mem er 36. A casing 33 is provided for the valve mecha nism.

Having thus described the controlling mechanism, I shall now explain the operation of the complete burner andvalve arrangement, after which I shall point out what constitutesthe novel features of my invention in the appended claims.

Starting from the position of parts as shown in Fig. 1 (and by broken lines in Fig. 3) where the valve ports are related as in Fig. 4 andwhere the main mantle burner is lighted and adapted for continuous operation,when it be desired to extinguish the light, control chain 65 is pulled downwardly which moves the parts to the position indicated in Fig. 8, where the valve ports are related as shown in Fig. 5. It will be seen that the small port 1 9 in the valve plug now registers with the corresponding port 26 leading to the auxiliary burner 21 in the valve block, and that gas is thereby supplied to said auxiliary burner which then ignites,

as heretofore described, from the heat of the main mantle burner, the supply of gas to which latterburner has been substantially unaltered by movement of the valve plug.

The flame of the auxiliary burner now plays against the hooded terminal 57' of the heater 56 as shown in Fig. 8, which latter member conducts heat from said flame to the thermostat. The thermostat upon being thus heated, straightens, or bends'generally out- 'wardly, assuming the broken line position indicated in Fig. 8 after a certain time interval, whereupon the spur 52 releases the supplying gas to the main mantle burner,

by pulling downwardly on chain 68. This restores all parts to the original positions shown in Figs. 1 and 4 as before explained. It should be noted that in this position, no gas is supplied to the auxiliary burner 21 and that the main mantle is adapted to re main in operation for an indefinite period of time.

It will be apparent to those skilled in the art that the precise embodiment of my invention herein chosen for illustrative pur poses may be still further varied in many respects without departing from the essential governing organization contained therein, and constituting the real invention.

Having thus broadly described the construction and operation of a preferred embodiment of my present invention, what I claim as new is:

1. In an upright mantle gas lamp and controlling valve arrangement embodying a Bunsen burner stem and automatic agencies for governing the valve, said agencies including an auxiliary heater burner arranged laterally of said Bunsen stem, in combination; a mantle-carrying lamp structure removably mounted on the Bunsen stem above said auxiliary burner and comprising a transparent chimney and holder therefor, the latter having an annular floor portion t the base of said chimney separating the mantle from said auxiliary heater burner; and an open-ended gas-directive tube opening through and protruding downwardly from the floor portion of the removable chimney holder and carried thereby in a position to terminate at its lower end directly above the flame orifice of said auxiliary burner. i

2. In an upright mantle gas lamp and controlling valve arrangement embodying a Bunsen burner stem'and automatic agencies for govern ng the valve, sald agencles including an auxiliary heater burnerarranged laterally of saidBunsen stem, in combination; a mantle-carrying-lamp structure removably mounted on said Bunsen stem above said auxiliary burner and comprising a transparent chimney and holder therefor, the latter 7 having an annular floor portion between said Bunsen stem and the base of said chim- 15 ney separating said auxiliary burnerr from the mantle; and an unconstricted gas directive tube fixedly secured to and substantially portion of said chimney holder and extending downwardly therefrom to terminate at 'flush at-its upper open end with said floor Signed in Boston, Massachusetts, this first day of August, 1916. a r

' RAYMOND YD. SMITH,

Witnesses: V

7 JA ES D. GORDON, -JOHNVLANIGAN. v 

